Hey there, you can add these fields yourself for now, they shouldn't get deleted/modified when you run Lemon after that. My reason for not adding them was that the ConfigParser module had some issues with UTF-8 and that by adding the title field I would also be exposed to the choice of adding more besides that, e.g. the summary, the author etc.
If you want an alternative to Lemon check out
FanFictionDownLoader, I just made a post there with some suggestions and hope to be able to eventually deprecate Lemon in favor for it.